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Ajouter le résultat dans votre panierRecovery of chromium(III) ions from aqueous solution by carboxylate functionalized wood fibres / Yin Zhonglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)
Titre : Recovery of chromium(III) ions from aqueous solution by carboxylate functionalized wood fibres Type de document : texte imprimé Auteurs : Yin Zhonglong, Auteur ; Chen Baihua, Auteur ; Chen Min, Auteur ; Hu Sheng, Auteur ; Cheng Haiming, Auteur Année de publication : 2015 Article en page(s) : p. 101-106 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique
Adsorption
Carboxylate
Chrome trivalent
Eaux usées -- Recyclage
Greffage (chimie)
Laine
Récupération (Déchets, etc.)
Solutions aqueuses (chimie)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The application of wool fibres for recovery of heavy metal ions is equivalent to the use of one waste to clean-up of another. A carboxylate functionalized wool fibre (PAA-g-Wool) was prepared by grafting poly(acrylic acid) onto the surface of wool fibre in the presence of potassium permanganate and oxalic acid as a redox initiator system. The graft percentage was 80.2%. The PAA-g-Wool adsorbent was applied to absorb chromium(III) from aqueous solutions in a batchwise manner. The optimum pH for recovery of chromium(III) by PAA-g-Wool was found to be 6.0. Kinetic studies show that the sorption process agrees with the pseudo-second-order kinetic model, with the correlation coefficient (R2) more than 0.99. The adsorption equilibrium of chromium(III) was well defined by the Langmuir isotherm equation, and the adsorption capacity was found to be 95.78mg/g calculated by the Langmuir isotherm equation. After recycling for 5 times, the adsorption capacity of PAA-g-Wool to chromium ions was still maintained at 90%. The PAA-g-Wool could recover 97.1% of chromium(III) ions in the tannery wastewater. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of PAA-g-wool fibres - FTIR analysis - SEM analysis - Batch adsorption experiments - Effect of initial pH - Effect of contact time - Effect of initial concentration of chromium (III) - Desorption and recycling experiments - Treatment of tannery wastewater
- RESULTS AND DISCUSSION : Preparation and characterization of PAA-g-wool - Effect of pH - Adsorption kinetics - Adsorption isotherms - Recycling adsorption - Treatment of tannery wastewaterEn ligne : https://drive.google.com/file/d/14Bf5R3-VSJ7uyRn6R4GbQBB8Zk8r-r-s/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24252
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 101-106[article]Réservation
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Titre : Preservation of goatskin using tamarindus indica leaf extract - Green process approach Type de document : texte imprimé Auteurs : A. Tamil Selvi, Auteur ; James Kanagaraj, Auteur ; P. Saravanan, Auteur ; V. Brindha, Auteur ; T. Senthilvelan, Auteur Année de publication : 2015 Article en page(s) : p. 107-114 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Conservation
Cuirs et peaux de chèvres
Extraits de plantes:Extraits (pharmacie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Preservation of animal skin using common salt is widely followed globally and has been in vogue since time immemorial. Salt used for preservation is discharged along with the soak liquor and contributes to 70% of TDS load from leather manufacturing. As an attempt to reduce chloride and TDS, plant based preservation with Tamarindus indica was studied. Different concentrations of salt and Tamarind leaf extract were applied on freshly-flayed goatskins based on its green weight and compared with control (40% salt alone/kg of skin wt.). Sensory evaluation of the preserved skin was done every day (till 21st day) for smell, hair slip and putrefaction. The samples were collected on 1st, 2nd, 3rd, 71h, 14th and 21st day and tests such as moisture content, total nitrogen content, protein content, hydroxyproline content and microbial load for finding out the curing efficiency. Skin those were preserved for 21 days were processed into leather and the leather and properties were examined. The result showed that 15% salt with 15% Tamarindus indica and 10% salt with 15% Tamarindus indica (Test) showed good preservation systems. Note de contenu : - Skin - Plant extract
- Minimal inhibitory concentration (MIC)
- FT-IR analyses
- Preservation experiments
- Determination of moisture content
- Determination of total extractable nitrogen content
- Hydroxyproline estimation
- Determination of bacterial count
- Pollution load generated in soaking process
- Leather making
- Physical strength properties of leather
- Colour measurementEn ligne : https://drive.google.com/file/d/1imFQyIcMmGd4FjqpKyROPTn8IewrIBbE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24253
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 107-114[article]Réservation
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Titre : A way to reduce injury to skin in enzymatic unhairing Type de document : texte imprimé Auteurs : Jian Song, Auteur ; Tao Wenyi, Auteur ; Wuyong Chen, Auteur Année de publication : 2015 Article en page(s) : p. 115-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antienzymes
Epilage enzymatique
Ethylène diamine tétra acétiqueL'EDTA (Ethylène Diamine Tétra Acétique), ou acide éthylène diamine tétraacétique, est un acide diaminotétracarboxylique de formule C10H16N2O8.
L'EDTA comporte six sites basiques, quatre correspondant aux bases conjuguées (carboxylates) des fonctions carboxyliques et deux correspondant aux fonctions amines. Ces sites basiques sont également des centres ligands, faisant de l'EDTA un ligand hexadentate (ou parfois tétradentate, lorsque seuls les sites carboxyliques sont utilisés). C'est d'ailleurs sa principale caractéristique, son fort pouvoir chélatant (ou complexant) par lequel il forme des complexes métalliques très stables, ce qui en fait un traitement en cas d'intoxication aux métaux lourds comme le plomb, avec une concentration adaptée (Voir Applications et chélation). Dans les complexes, l'EDTA est lié aux cations métalliques sous la forme d'une de ses bases conjuguées9.
MétalloprotéinasesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Enzymatic unhairing is a cleaner production method. However, the main difficulty which hinders the utilization of protease in unhairing is the injury to skin caused by the protease. In this article, a collagenase was purified from the protease (2709). The particular collagenase is a metalloprotease which is inhibited by EDTA. On the other hand, 2709 itself is a serine protease which is insensitive to EDTA. A way to reduce the injury to skin was put forward. When 10mM EDTA is added to crude enzyme solutions of 2709, the protease (2709) retains 90.5% of the proteolytic activity, and the unhairing capacity of 2709 has little loss. AI the same time, 2709 loses 66.9% of the collagenolytic activity since the collagenase is inhibited by EDTA. Therefore, the injury to skin will be reduced. Note de contenu : - MATERIALS AND METHODS : Enzymes - Determination of the proteolytic activity - Determination of the collagenolytic activity - Purification of collagenase from the protease (2709) - SDS-page - Effect of EDTA on the proteolytic activity and the collagenolytic activity - Preparation of pigskins - Effects of EDTA on enzymatic unhairing - Analysis
- RESULTS AND DISCUSSION : Summary of purification of collagenase from the protease (2709) - SDS-page of the purified collagenase - Effects of EDTA on the proteolytic activity and the collagenolytic activity - Effects of EDTA on enzymatic unhairingEn ligne : https://drive.google.com/file/d/1IoAuRhQp_sM_t5V5YIeqgwmUge9VYHic/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24254
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 115-119[article]Réservation
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Titre : Effect of mixed metal pretannage with zinc and titanium plus masking agents Type de document : texte imprimé Auteurs : Shan Cao, Auteur ; Baozhen Cheng, Auteur ; Bing Liu, Auteur ; Xiu He, Auteur Année de publication : 2015 Article en page(s) : p. 120-123 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Agents masquants
Sulfate de titane
Sulfate de zinc
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
Wet-white (tannage)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper focuses on the effect of masking agents and tanning with zinc and zinc-titanium metal complexes. Sodium formate, sodium acetate, sodium citrate and sodium tartrate were used as masking agents. The best masking condition was chosen corresponding to the highest shrinkage temperature. Zinc sulfate and titanium sulfate, in different concentrations, were chosen as tanning agents in mixed-tanning experiments. The highest shrinkage temperature of the wet-white was 77°C, and the attendant zinc content in its leather was 3.63%. After retannage with chrome powder, the shrinkage temperature of the resultant leather increased as expected, and reached 96°C. The wet-white was successfully split which tend to the use of non-chrome pre-tanning, the finished leather was able to meet the requirements. Note de contenu : - EXPERIMENTAL PROCEDURES : Equipment - Materials - Preparation of measuring reagents - Preparation of mixed-metal tanning agents
- EXPERIMENTAL PROCEDURE : Influence of masking agents zinc tanning - Zinc-titanium mixed tanning
- RESULTS AND DISCUSSION : Influences of masking agents on zinc tanning - Effect of mixed zinc-titanium tanning - Effect on retanning of the mixed metal tanning wet-whiteEn ligne : https://drive.google.com/file/d/1MakJVyW6_eI8GMNg4NAJcxzaaoH6XVp0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24255
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Titre : Composition, structure and properties of immunized hair from hair-saving unhairing process Type de document : texte imprimé Auteurs : Kong Lili, Auteur ; Jinwei Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2015 Article en page(s) : p. 124-128 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Cuirs et peaux de bovins
Epilage enzymatique
Essais (technologie)
Immunisation (épilage)
Résistance chimiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The immunized cattle hair from a hair-saving unhairing process was observed by Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM), and the elements in the cortex were analyzed by Energy Dispersive X-ray Spectroscopy (EDS), while the original hair was used as control. The différences of resistance to acid, alkali, oxidant and enzyme between immunized hair and original hair were also compared. The results showed that the thickness of the immunized hair squame decreased by approximately 30.01%, and the surface morphology was obviously damaged compared with the original hair. Calcium and magnésium were found in the immunized hair, while the content of sulfur decreased slightly ; the antioxidant properly of the immunized hair was improved greatly, but the acid resistance, alkali resistance and enzyme resistance were reduced significantly. In general, the composition, structure and properties of the immunized hair showed great changes after hair-saving unhairing process, these changes form the basis for the utilization of the immunized hair. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - Structure and composition test - Chemical resistance test - Enzyme resistance test
- RESULTS AND DISCUSSION : Squama analysis - Elemental analysis - Property of enzyme resistanceEn ligne : https://drive.google.com/file/d/1mWpEt6etsB2aA52ZY8bli2nvwB9el-fx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24256
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 124-128[article]Réservation
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Titre : Dechroming of chromium-containing leather waste with low hydrolysis degree of collagen Type de document : texte imprimé Auteurs : Wei Ding, Auteur ; Xuepin Liao, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 129-133 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux
Collagène -- Détérioration
Cuirs et peaux -- Déchets -- Recyclage
Déchromage
Hydrolyse
Séparation (technologie)
Sulfurique, AcideIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dechroming is essential for utilization of chromium-containing leather wastes. Strong hydrolysis conditions favour breaking of the Cr and collagen linkage, but lead to a high degree of hydrolysis of the collagen se that the separation of chromium from the gelatinous hydrolysates becomes difficult. In this research, a mild acid-alkali alternate treatment of the waste with hydrolysis assistants was investigated, so as to develop a technology that has high dechroming level and low hydrolysis degree of collagen. A satisfactory dechroming method with four steps was finally obtained and the reaction conditions for each step were optimized as follows. Step 1 — waste in the solution with 2g1L NaOH and 40g/L urea {hydrolysis assistant) was stirred for 0.5 hours at 40°C. Step 2 — waste in 50g/L sulfuric acid solution was stirred for 1 heur at 40°C. Step 3 — waste in 40 g/L Cap% suspension was stirred for 2 hour at 30°C. Step 4 — waste in 50g/L suffuric acid solution was stirred for 1 hour at 30°C. With this method, total extent of the dechroming of the waste was higher Chan 97% while the hydrolysis degree of collagen was lower than 10%. Note de contenu : - MATERIALS AND METHODS : Materials - Dechroming procedure of the leather waste - Estimation of the degree of hydrolysis of collagen
- RESULTS AND DISCUSSION : Effect of hydrolysis assistant on extent of dechroming - Effect of reaction temperature on dechroming extent - Effect of sulfuric acid concentration on dechroming extent - Effect of calcium hydroxide concentration on extent of dechroming - Hydrolysis degree of collagenEn ligne : https://drive.google.com/file/d/190QFQUqFJeTolMygTcMeLAUQr_rYV12n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24257
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Titre : Simultaneous determination of N-methyl-2-pyrrolidone (NMP) and N-ethyl-2-pyrrolidone (NEP) in leather by gas chromatography-mass spectrometry Type de document : texte imprimé Auteurs : Sang Jun, Auteur ; Yu Lingyun, Auteur ; Shudong Xie, Auteur ; Feng Zhang, Auteur ; Zhang Xiaolei, Auteur ; Wei Lin, Auteur Année de publication : 2015 Article en page(s) : p. 134-138 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase gazeuse
Cuir -- Teneur en solvants
Cuirs et peaux -- Analyse
Extraction (chimie)
N‐éthyl‐2‐pyrrolidone
N-méthyl-2-pyrrolidoneLe N-méthyl-2-pyrrolidone ou 1-méthyl-2-pyrrolidone, généralement abrégé en NMP, est un liquide incolore ou jaune clair. C'est un amide cyclique (lactame) souvent utilisé en tant que solvant organique.C'est un solvant hygroscopique, miscible avec l'eau et la plupart des solvants organiques. C'est une base faible: une solution aqueuse contenant 10% de NMP a un pH de 7,7-86.
Utilisation : Ce composé est principalement utilisé comme solvant à cause de ses propriétés physiques: faible volatilité, stabilité thermique, solvant polaire et aprotique. Ses propriétés toxicologiques en font un bon candidat pour le remplacement de solvants chlorés.
Les domaine d'utilisation sont vastes : en pétrochimie, il sert de solvant d'extraction pour les composés aromatiques et le butadiène ou de purification des gaz (récupération du dioxyde de carbone et du sulfure d'hydrogène); en électronique, il sert de solvant de nettoyage pour les wafers de silicium; en chimie, il est utilisé comme solvant de réaction ou de formulation ; comme agent de nettoyage dans l'industrie des métaux (dégraissage).
Spectrométrie de masseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : N-Alkyl-2-pyrrolidones such as N-methyl- and N-ethyl-2-pyrrolidone (NMP and NEP) are widely used as solvents in leather finishing agents. However, NMP and NEP were identified as reproductive toxicants. Moreover, NMP has been listed in the Candidate List of Substances of Very High Concern (SVHC) by European Chemicals Agency. Herein, we have developed a simple and rapid gas chromatography-mass spectrometry method for the simultaneous determination of NMP and NEP in leather samples. The extraction solvent, methods and time have bean comparatively investigated and optimized for enhancing the extraction efficiency of NMP and NEP in samples. Under optimal extraction and GC-MS conditions, the linear range of both NMP and NEP were between 0.5 and 100mg L-1 with regression coefficients (R2) of 0.999. The Relative standard deviation (R.S.D.) for ten replications of analysis was 2.6% and 2.8% for NMP and NEP, respectively. And limit of detection (LOD) for NMP and NEP were bath 0.1mg/kg. In leather samples the mean recoveries were 94.8%-105.6% and 98.5%-105.2% for NMP and NEP, respectively. The proposed method has been proved to be applicable for the simultaneous determination of the target NMP and NEP in leather samples. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Chemicals and reagents - GC-MS conditions - Extraction - Quantification
- RESULTS AND DISCUSSION : Extraction solvent selection - Extraction method and extraction time - Specificity - Linearity and detection limit - Recoveries and precision - ApplicationEn ligne : https://drive.google.com/file/d/1n6lixOlOvHknZmlCsXZ0TDaZUMP7aqib/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24258
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 17271 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
